摘要:
通过对古汉山矿二1煤层裂隙观测统计,分析了煤层裂隙开启、闭合特征,矿井东区N50°E走向裂隙组受地应力相对拉张作用,矿井西区N30°E走向裂隙组受地应力相对拉张作用,预测矿井东区、西区煤层渗透性优势方位分别为N50°E、N30°E。矿井西区煤层渗透率现场测试表明,沿N55°W方向测试钻孔渗透率数值均远大于其它方向,煤层渗透性优势分布方位为N35°E,现场测试结果与煤层渗透性优势方位预测基本一致。鉴于二1煤层渗透性分布特征,探讨了水力压裂、酸化煤层等措施对煤层渗透性的影响,提出了矿井瓦斯最优瓦斯抽采方案,即东区瓦斯抽采钻孔设计应与N50°E向垂直、西区瓦斯抽采钻孔设计应与N35°E向垂直。
Abstract:
Through the observation statistics of Guhanshan Coal Mine coal seam fractures, the coal fracture opening and closing control features is analyzed, eastern gas geological unit N50°E to fracture group affected by in situ stress relative tension, the western gas geological unit N30°E to fracture affected by the relative stress and tension in and prediction of mine gas geology units of the eastern, the western gas geological unit of coal seam permeability advantage range is N50°E, N30°E, respectively. Field test results show that the coal seam permeability presents anisotropic distribution, along the N55°W direction, the measurement of borehole permeability value is far greater than in the other direction, the advantage distribution range of coal seam permeability is N35°E, the results of field tests and coal seam permeability advantage range prediction is consistent. In view of the permeability distribution characteristics of Ⅱ1 coal seam, the influence of hydraulic fracturing, acidizing coal seam and other measures on the permeability of coal seam is discussed. The optimal gas mine gas extraction solution is proposed, namely, eastern gas drainage by drilling design should be vertical to N50°E, and western gas drainage by drilling design should be vertical to the N35°E.
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